12840343 has 2 divisors, whose sum is σ = 12840344. Its totient is φ = 12840342.

The previous prime is 12840337. The next prime is 12840361. The reversal of 12840343 is 34304821.

12840343 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (34304821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12840343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12840313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6420171 + 6420172.

It is an arithmetic number, because the mean of its divisors is an integer number (6420172).

Almost surely, 2^12840343 is an apocalyptic number.

12840343 is a deficient number, since it is larger than the sum of its proper divisors (1).

12840343 is an equidigital number, since it uses as much as digits as its factorization.

12840343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 12840343 is about 3583.3424340970. The cubic root of 12840343 is about 234.1669189147.

The spelling of 12840343 in words is "twelve million, eight hundred forty thousand, three hundred forty-three".